One-Pot Synthesis of Dihydropyrimidine-Thione Derivatives Using Tungstate Sulfuric Acid (TSA) as a Recyclable Catalyst

Nano-ZrO2 sulfuric acid: a heterogeneous solid acid nano catalyst for Biginelli reaction under solvent free conditions

Nano-ZrO₂ sulfuric acid [n-ZrO₂–SO₃H (n-ZrSA)] has been synthesized from the reaction of nano-ZrO₂ with chlorosulfonic acid as sulfonating agent.

Nanocatalytic one-pot, four-component synthesis of some new triheterocyclic compounds consisting of pyrazole, pyran, and pyrimidinone rings

A new series of triheterocyclic compounds containing pyrazole, pyran, and pyrimidinone rings was synthesized via a one-pot condensation of ethylacetoacetate, hydrazine hydrate, barbituric acid, and aromatic aldehydes in the presence of catalytic amounts of titanium dioxide nanowires.

Solvent-free and One-pot Synthesis of Trisubstituted Methanes Containing Coumarin Catalysed by Yttrium(III) Nitrate

A one-pot method has been developed for the synthesis of novel trisubstituted methanes containing coumarin by the reaction of 4-hydroxycoumarin with aryl glyoxal and benzamide under solvent-free conditions. The reactions were efficiently catalysed by yttrium(III) nitrate to afford corresponding products in moderate to good yields. The synthetic procedure is simple, inexpensive and environmentally friendly.